# list · Rell standard library · Chromia Docs (concept) > type list: collection Represents a mutable array list. Subtype of collection . See Also collection - Rell Standard Library Since 0.6.0 Methods _s Source: https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/ TYPE # list ```signature type list: collection ``` Represents a mutable array list. Subtype of `collection`. **See Also** 1. [`collection` - Rell Standard Library](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/collection/) Since 0.6.0 ## Methods [\_set](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/_set/) : Set the element at the specified index, overwriting the element that was previously at that index. [\_sort](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/_sort/) : Sort this list in place. [add](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/add/) : Insert a value at the specified index. Any elements previously occurring at and after the specified [addAll](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/add-all/) : Insert all elements from a collection at the specified index. Any elements previously occurring at [add\_all](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/add_all/) : Insert all elements from a collection at the specified index. Any elements previously occurring at [add\_all\_copy](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/add_all_copy/) : Returns a new list that is the concatenation of the elements of this list with those of the given [clear](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/clear/) : Clear this collection; i.e. remove all its elements. Immediately after this method returns, this [contains](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/contains/) : Check if this collection contains the given element. [containsAll](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/contains-all/) : Check if this collection contains all elements of another collection. [contains\_all](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/contains_all/) : Check if this collection contains all elements of another collection. [empty](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/empty/) : Check if this collection is empty. [get](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/get/) : Retrieve the element at the specified index. [indexOf](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/index-of/) : Search for the first occurrence of the specified element within this list. [index\_of](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/index_of/) : Search for the first occurrence of the specified element within this list. [join\_to\_text](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/join_to_text/) : Generate a textual representation of this iterable. [len](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/len/) : Get the size (number of elements) of this collection. [list](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/list/) [remove](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/remove/) : Remove an element from this collection. [removeAll](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/remove-all/) : Remove all elements in another collection from this collection. [removeAt](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/remove-at/) : Remove and return the element at the specified index. The indices of elements occurring after the [remove\_all](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/remove_all/) : Remove all elements in another collection from this collection. [remove\_all\_copy](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/remove_all_copy/) : Returns a new list whose elements are those found in this list and not in the given collection. [remove\_at](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/remove_at/) : Remove and return the element at the specified index. The indices of elements occurring after the [repeat](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/repeat/) : Repeat this list n times. [retain\_all](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/retain_all/) : Retain in this collection only those elements found in the given collection. In other words, remove [retain\_all\_copy](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/retain_all_copy/) : Return a new list whose elements are those found in both this list and the given collection, or in [reverse](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/reverse/) : Reverses the order of the elements in the list in place. [reversed](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/reversed/) : Returns a new list with the elements of this list in reverse order. [set](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/set/) : Set the element at the specified index, overwriting the element that was previously at that index. [size](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/size/) : Get the size (number of elements) of this collection. [sort](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/sort/) : Sort this list in place. [sorted](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/sorted/) : Sorts the elements of this collection into a list. This collection is not modified. [str](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/str/) : Returns a textual representation of this collection. [sub](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/sub/) : Returns a sublist of this list starting from the specified index (inclusive). [to\_text](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/list/to_text/) : Returns a textual representation of this collection. [View this page on docs.chromia.com](https://docs.chromia.com/pages/rell-stdlib/-rell%20-system%20-library/%5Broot%5D/list/index.html)Generated API reference, mirrored from the live docs